Process of purifying gas.



E. L. HALL.

PROCESS OF PURIPYING GAS.

APPLICATION nnnn JULY 11.1908.

Patented Feb. 2, 1909.

cu L N\ A 4 altozueqm UNITED STATES PATENT OFFICE.

ELMON' L. HALL, OF PORTLAND, OREGON, ASSIQ'NOR T0 SECURITY SAVINGS AND TRUST COMPANY, OF PORTLAND, OREGON; A' CORPORATION OF OREGON.

raoonss or ru'arrrmo GAS.

ratented Feb. 2, 1909- Tanll whom it may concern: Be it known that I, E'Liros L. HALL, a citizen of the United States, residing at Fifth nd Yamhill streets, Portland, Oregon have invented a new and useful Process oi Purifying Gas, of which the following is a specification.

My invention relates to improvements m the purification of illuminating gas and its object is to remove from such as, after it has been purified-as much as possi is by hitherto known methods, the organic compounds of. sulfur which remain therein and which hitherto have been considered unremovable. Illuminating gas, and es ecially that made from the crude oils of the acific coast, contains when first manufactured or anic sulfur in the form of carbon bisuhi and inorganic sulfur in the form of sulfureted hydro en. It is highly desirable to remove both 0 these before using the as for illuminating purposes, as theyI are 0 noxious and injurious substances. eretofore but little difliculltfy has been experienced in removing the su ureted hydro en, which result has been accom lished y passing the as through a be y'oi-lime or oxid of iron and y othermethods. This 0 eration has no effect on the carbon bi-sulfid, ut leaves it remaining in the gas, and heretofore there has been no known method, so far as I am aware, of removing it. The result is that when the gas is burned at the burner ti this carbon i-sulfid is converted into sul urous acid, a product which is injurious to metallic objects in the room where the as is burning and also deleterious to persons reathing it.

- The object of my invention is the removal of this carbon bi-sulfid from gas which has been partially purified by the removal of the sulfereted hydrogen, and this I accomplish by first converting the carbon bi-sulfid into sulfureted hydro an and then removing the latter by any 0% the methods heretofore used for that purpose.

In the annexed drawings I have illustrated one form of apparatus by which my process may be carrie out.

i ure 1, representsan elevation and Fig. 2 a p an view of the apparatus.

In the drawings A represents the generator and B and C the reheaters similar to ordinary water gas superheaters, containing loose or checker work fire brick. The generator is provided with a hopper 2 for the continuous supply of fuel and with cleaning doors 3, 4 and 6 and air inlet 6. The generator is connected by means of pipes 7 or 8 and 9 with the reheater B and by the pipes 10 or 11, and 12 with the reheater C. After the reheater B has become sufliciently heated for,

service, it is cut off from the generator by closing the valve 17 and the valve 18 is opened to connect the generator with reheater 0. When the latter is sufiiciently heated, the connections are reversed for the urpose of again heating the reheater B.

hen solid fuel is used the pi es 8 and 11 are turned to cut oil communication etween 'the generator and the reheater C, and the valve 17 in the pipe 9 is turned to open communication between the generator and the reheater B. Gas to be purified is admitted to the reheaters by the inlets 19 and 20 and steam is introduced at 21 and 22. The reheater-s have valves 23 and 24 b which the reheaters are connected throu h pipes 25 and 26 with the stack during t 0 process of heating. They are also connected y means of pipes 27 and 28 and 29 and 30 res ectively, with seal D. This seal is provi ed with an outlet 31 leading to the coolers and purifiers (not shown), and also with a water overflow pipe 32 leadin to an overflow tank 33, by means of which the water in the seal is maintained at a roper level.

By means of the described connections the generator is operated continuously, and connected alternately with the reheaters.

According to m invention it is necessary that the gas, whio is to be purified, should be subjected to a high degree of heat, which in practice varies from "SIX hundred to one thousand degrees centigrade. After one of the reheaters has been raised to that temperature the gas is introduced therein and carried through the described coolers and purifiers, the enerator being meanwhile con nected with the other reheater for the Ipurpose of raising its temperature sufiicieht y to receive a supply of gas when the first "reheater has been cooled in practice, thus making the operation continuous. In sub- 'ecting the gas to the high tem eratures used y me hydrogen will be s lit 0 from the hydro-carbons of the gas, t us furnishing nascent hydro en. And furthermore, as the as passes t ough the checkerwork of the reeater, the aqueous vapor, which normally is present in the gas, is decomposed, and thereby a further so ply of nascent hydrogen is reduced. The igh degree of heat used w I operate to break up the sulfids present (carbon bi-sulfid etc.) and the nascent hydrogfn roduced as above described unites with t e iberated sulfur of the as to roduce sulfureted hydrogen, whic is a terwards removed by the ordinary process of purification.

I have found in practice that the introduction of steam into the reheater intensifies the reactions, due to the better conductivity of the steam for heat than the gas alone, thus enabling the latter to better attain the requlsite temperature. And furthermore, the steam furnishes an additional sulppl of nascent hydrogen for union with t e liberated sulfur of the gas. Consequently, I desire it to be understood that'I ma carry out my invention either with or wit out the aid of steam.

It will be observed from the fore oing that my invention is primarily intende to operate upon so-calle purified gas, that is to say,

as which has already been freed, b well nown methods, of the sulfureted hydrogen produced at the time of manufacture, and which. as in that condition is sup osed to be ready or consumption, but whic as a matter of fact contains carbon bi-sulfid. I take the gas in the condition in which it is ordinarilg consumed still containing carbon bisulfi and I further purify it by removing this carbon bi-sulfid so as to produce an absolutely pure article of gas which contains neither organic nor inor anic sulfur compounds, and this I accomp ish b converting carbon bi-sulfid into sulfureted ydro en b the action of heat and then removin t e su fureted h drogen by anyvof the we 1 known methods heretofore practiced.

I do not herein claim the apparatus shown, but reserve the same for a future application to be filed in due season.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 4 1. The process of further urifying illuminatingdgas which has alrea y been partially purifie by the removal of sulfurete hydrogen but which still contains carbon bi-sulfid, consisting in reheating the gas to a hi h temperature whereby the carbon bi-sulfi is converted into sulfureted h drogen, and" then removing the sulfureted hydrogen.

2. The process of further urifying illuminating as which has alrea y been partially purifie b the removal of sulfurete hydrogen but w 'ch still contains carbon bi-sulfi (1, consisting in reheating the gfas to a high temperature in the resence o steam whereby thecarbon bi-su id is converted into sulfureted'hydroglen and carbon di-oxid, and then removlng t e sulfureted hydro en.

In witness whereof, I have ereunto set my hand at the city of Portland, Oregon this 14th day of May, 1908.

ELMON L. HALL.

Witnesses:

H. M. PAYNE, JOHN J. Enxms. 

